Alkyd resin emulsion

• US 6,780,910 B2
• Filed: 11/26/2002
• Issued: 08/24/2004
• Est. Priority Date: 05/31/2000
• Status: Expired due to Fees

• Current Assignee: Croda International PLC
• Original Assignee: Imperial Chemical Industries PLC (IMPERIAL CHEMICAL INDUSTRIES)
• Inventors: Dehuvyne, Bart Simon Alfons, Bouvy, Alain
• Primary Examiner(s): NILAND, PATRICK DENNIS
• Application Number:
  US10/304,016
• Publication Number:
  US 20030144397A1
• Time in Patent Office: 637 Days
• Field of Search: 524/366, 524/376, 524/77, 524/599
• US Class Current: 524/376
• CPC Class Codes: C08J 2367/08 Polyesters modified with higher fatty oils or their acids, or with resins or resin acids
• CPC Class Codes: C08J 3/03 in aqueous media
• CPC Class Codes: C08L 71/00 Compositions of polyethers obtained by reactions forming an ether link in the main chain of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06; Compositions of derivatives of such polymers
• CPC Class Codes: C09D 167/08 Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids

Abstract

An aqueous emulsion of an alkyd resin which contains as an emulsifier at least one branched primary alcohol alkoxylate of the formula (I): [CH₃.(CH₂)_n][CH₃.(CH₂)_m].CH.[(CH₂)_p.O.(AO)_q.H], where n and m are each independently from 1 to 13; and p is 1 or 2; such that n+m+p is from 5 to 15; AO is an alkylene oxide residue having from 2 to 4 carbon atoms, and q is from 5 to 50. The alkyd emulsion is particularly suitable for use as a waterborne paint or surface coating composition.

Claims

1. An aqueous emulsion of an alkyd resin which comprises as an emulsifier an emulsifying amount of an at least one branched primary alcohol alkoxylate of the formula(I):

2. An emulsion as claimed in claim 1 in which in the compound(s) of the formula (I), n and m are each independently at least 2 and not more than 12, p is 1 and the total number of carbon atoms in the branched alkyl residue is from 8 to 18.

3. An emulsion as claimed in claim 1 in which in the compound(s) of the formula (I), q is 10 to 30;

the residues AO are of ethylene oxide, propylene oxide or a mixture of ethylene oxide and propylene oxide residues; and

, if the residues AO include propylene oxide residues, the molar ratio of ethylene oxide to propylene oxide residues is from 1;

5 to 10;

1.

4. An emulsion as claimed in claim 1 in which the compound(s) of the formula (I) are used in admixture with at least one alkoxylate of a linear primary alcohol containing a similar number of carbon atoms and in which the proportion of branched alkoxylate is at least 40%.

5. An emulsion as claimed in claim 1 in which the compound(s) of the formula (I) are used in admixture with at least one anionic emulsifier.

6. An emulsion as claimed in claim 5 in which the at least one anionic emulsifier comprises at least one of:

phosphate esters, ether carboxylates, alkyl ether sulphate, alkyl aryl sulphonates or mixtures of these types of anionic surfactants.

7. An emulsion as claimed in claim 6 in which the anionic emulsifier is or comprises at least one ether carboxylate of the formula (II):

8. An emulsion as claimed in claim 5 in which the anionic emulsifier is or comprises at least one alkyl benzene sulphonate.

9. An emulsion as claimed in claim 5 in which the weight ratio of non-ionic surfactant (comprising compound(s) of the formula(I)) to anionic surfactant is from 80:

20 to 20;

80.

10. An emulsion as claimed in claim 1 in which the total amount of surfactant, non-ionic and (when used) anionic, emulsifier in the emulsion is from 5 to 15% by weight of the emulsion.

11. A method of making an emulsion as defined in claim 1 which comprises the steps of forming a mixture of the resin and surfactant, comprising at least one branched primary alcohol alkoxylate surfactant of the formula (I), comprising water in the mixture to form a water in oil (resin) emulsion, and subsequently adding water to the water-in-oil emulsion at least until the emulsion inverts to form an oil (resin) in water emulsion and, optionally, adding further water to adjust the disperse phase content of the emulsion to that desired.

12. A waterborne paint or surface coating composition which comprises an alkyd emulsion as defined in claim 1.

13. A waterborne paint or surface coating composition as claimed in claim 12 which additionally comprises at least one of:

driers (or curing catalysts);

co-driers;

rheology modifiers;

wetting and compatibility agents; and

/or flow and levelling agents.